There are approximately 2 1/2 cups of brown sugar in 1 pound. The exact amount of cups is dependent upon how packed the brown sugar is when measuring.
If the sugar is not packed down firmly, users can get around 3 to 3 1/2 cups of brown sugar for every pound. Most recipes calling for brown sugar require the sugar to be firmly packed. For powdered sugar, 1 pound is equivalent to approximately 3 3/4 cups, and 1 pound of granulated sugar is equal to around 2 1/4 cups. If the powdered sugar is sifted, users will get more cups per pound.